通过对形变奥氏体组织进行长期时效观察合金相演化过程,研究了低放射性亚稳奥氏体Fe-Cr-Mn(W,V)合金的组织稳定性.实验表明:合金在高于400℃时,相平衡处在γ+α+σ三相区,低于400℃可以保证亚稳奥氏体的稳定性.亚稳奥氏体可以发生γ→ε→α′→α转变也可以发生γ→γ(f)→α′(f)→α转变,ε马氏体不是γ→α转变的唯一中间过渡相.形变诱发ε马氏体形成过程中伴随奥氏体晶粒碎化,可产生细晶强化作用,这是开发亚稳奥氏体Fe-Cr-Mn合金的重要途径.
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